Łuka is the name of the following places in Poland:
Łuka (Narewka) in the powiat Hajnowski, Podlaskie Voivodeship
Łuka (Rozogi) in the Powiat Szczycieński, Warmian-Masurian Voivodeship; until 1938 Lucka , 1938 to 1945 Luckau (Ostpr.) in the district of Ortelsburg, East Prussia